Hoisting apparatus



(No Model.)

0. W. HUNT.

HOISTING APPARATUS.

Patented Mar. 3, 1896.

w uREW B LinAHAMA PMUTOumO. WASHINGIBNA D C UNITED STATES ATENT OFFICE.

CHARLES W. HUNT, OF WEST NEW BRIGHTON, NEW YORK.

HOISTING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 555,703, dated March 3,1896.

Application filed October 11,1896. Serial No. 565,319. (No model.)

To aZZ whom it may concern:

Be it known that 1, CHARLES W. HUNT, a citizen of the United States,residing at Test New Brighton, in the county of Richmond and State ofNew York, have invented an Improvement in Hoisting Apparatus, of whichthe following is a specification.

Friction-drums have heretofore been provided in which either the drum isloose upon the shaft or the adjacent gear-wheel, the two being connectedby an annular friction-rib and groove, and an end motion has been givento the drum or to the gear to press the frictional surfaces into contactby a pin passing axially through a hole in the shaft. In the devices ofthis character difficulty has been experienced in lubricating the end ofthe pin where it is acted upon by alever or other device, and the resulthas been that the surfaces quickly cut out or become heated.

The object of the present invention is to give an end motion to theshaft itself, so that the pressure of one frictional surface upon theother is obtained by acting at opposite sides of. the journal box orframe, so thatthe parts are more easily lubricated and they can be mademuch larger and stronger than those heretofore employed.

In the drawings, Figure 1 is a vertical section illustrating the presentimprovement, and Fig. 2 is a similar view showing the same inventionwith the parts transposed.

The drum A is of any desired size and character and the wheel B is to bedriven by a pinion or other suitable motive power, and the annularfrictional surfaces are formed by the groove 3 and rib 4. It isgenerally advantageous to make the groove in the metal of the drum andto make the rib upon the gear-wheel, and the rib may be eithercontinuous of metal, or preferably in segments of wood bolted upon thewheel B, as represented; but, said frictional surfaces may be flat or ofany desired character.

The shaft 0 is represented as supported in the frame or bearing D, andthe end of the shaft projects beyond the bearing. In Fig.

1 the drum A is keyed at 5 to the shaft 0 and the wheel B is loose uponthe shaft 0, and there is a helical spring Ebetween the hubs of the drumand wheel, respectively, to tend to separate the frictional surfaces.

Upon the end of the shaft 0 a hollow nut G is screwed and preferablypinned to prevent the same unscrewing, and within the hollow nut is thehead 6 of the screw H, and preferably there is awasher around the screwand between the head 6 and the interior surface of the hollow nut G, andthis hollow nut G is preferably made with a cavity large enough tocontain the desired quantity of lubricating material, which may besupplied through a hole covered with a suitable cap.

The screw H passes through the frame or yoke K,and it is provided with acrank or lever L of suitable character, by which such screw H may berotated more or less.

The base of the yoke K sets against the side of the frame D and isadvantageouslybolted thereto, and it will now be apparent that when thelever or handle L is turned so as to screw the head 6 toward the bearingD the friction between the annular surfaces 3 and 4 is relieved and thegear-wheel B can rotate without revolving the drum A. If on the contrarythe lever or handle L is turned in the other direction and the screw Hmoved, so as to draw the head 6 away from the bearing D, the shaft 0 isdrawn endwise and the hub of the wheel B is resisted by one side of thebearing D, and the pressure of the yoke or frame K is on the other sideof that bearing. Hence there is no tendency to displace any of theparts, and the friction between the surfaces 3 and 4 will cause thegear-wheel to rotate the drum, and the pressure exerted in forcing suchsurfaces 3 and 4 together is resisted in one direction by the side ofthe bearing D and in the other direction by the hollow nut G pressingagainst the washer and head 6 of the screw H, and in this condition theweight connected with a chain or rope around the drum A can be drawn upand the reverse movement of the handle L will relieve the frictionbetween. 3 and 4 to any desired extent, allowing the drum to rotate asthe weight is lowered, and it will be noticed that the lubricatingmaterial passes to and spreads freely upon the surfaces that are pressedinto contact with each other.

When the parts are arranged in the manner shown in Fig. 2, thegear-wheel B is to be keyed upon the shaft 0 and the drum Aloosethereon, and the hub of the drum A comes at one side of the frame orhearing D, and the pressure against the same when the tension device isoperated causes the frictional surfaces 3 and 4: to engage each other,and the operations are the same as before described, the relativepositions of the drum and gearwheel being transposed.

It will be apparent that a lever might take the place of the screw, asindicated in Fig. 2, the head 6 being on a smooth rod that is connectedwith the lever L and which is pivoted on the yoke K. The operations ofthese parts are the same as those shown in Fig. 1.

I claim as my invention The combination with the bearings, of a shaftsupported by such bearings, a drum CIIIAS. W. HUNT. Witnesses:

GEO. T. PINCKNEY, S. T. IIAVILAND.

